My X2 is mounted on the top of a roll around toolbox, and I think it does vibrate a little more than it did when it was mounted on a solid (screwed to the wall) bench.
I don't think it affects the finish of the cuts though. With a small machine you are taking pretty small cuts anyway, if I get chatter, I take a smaller cut. I like the convenience of being able to get behind the machine, or move it around.